SAT Math Multiple Choice Practice Question 606: Answer and Explanation

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Question: 606

20. If and xy = 1, where x and y are greater than zero, what is the value of y?

A. 2
B. 3
C. 4
D. 5
E. 6

Correct Answer: A

Explanation:

A Start with the second equation, xy = 1. The only way for this to equal 1 would be if y = 0 or x = 1. The problem states that x and y are both greater than zero, which means that it must be that x = 1. Plugging that into the first equation gives us , so = 1, and y = 2.

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